The Devil’s Detective by Simon Kurt Unsworth Doubleday/Random House, $25.95, 358 pages, ISBN 978-0-091956-51-6 We’re continuing with our Freak-Fest of weird reads in observance of Halloween, and you’d better brace yourself . . . because this one’s gonna be a wild ride. So far this month, we’ve covered fallen angels and a shattered New York City where the survivors zonk out, choosing to escape reality in an alternate World